 function a(radius) {
  function clipLine(stream) {
    var point0;
    return {
        point: function(lambda, phi) {
        var point1 = [lambda, phi],
            point2;
            point2 = intersect (point0, point1);
            point2 = intersect(point1, point0);         
            point2 = intersect(point0, point1);
          
          var t = intersect(point1, point0, true);
        
      },
    };
  }

  // Intersects the great circle between a and b with the clip circle.
  function intersect(a, b, two) { 
  return 1;
  }
}
console.log(a(0.7));
